The guys a crazy Dane living an Aus who brought a island
Territory Tales: Kai Hansen, his pet crocodile Casey and living on Goat Island - ABC News (Australian Broadcasting Corporation)
It's a crocodile fess pit, from the looks feeding the croc and watching the dog race down to bark at it was a regular occurrence. Its not something the dog would of been trained to do, that's just a dog being a dog... followed up by a croc being a croc. ;)
Aussie swamp people, just like swamp people world wide...
btw the croc was his "pet" also hehe